Drawing-knife



(No Model.) J. S. CANTELO.

DRAWING KNIFE- h Patented July 23, 1895.

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- UNITE STATES PATE T OFFIC JOHN S. CANTELO, OF BOSTON, MASSACHUSETTS.

DRAWING-KNIFE.

SPECIFICATION forming part of Letters Patent No. 543,146, dated July 23,1895.

Application filed November l1I 1893- Serial No. 490,667. (No model.)

To all whom it may concern:

Be it known that 1, JOHN S. CANTELO, a

citizen of the United States, and a resident of Boston, in the county ofSuffolk and State of Massachusetts, have invented new and usefulImprovements in Drawing-Knives, of which the following, taken inconnection with the accompanying drawings, is a specification.

This invention relates to improvements on that kind of drawing-knives onwhich the handles are adjustable relative to the blade, and this myinvention is an improvement on the patent granted to me December 18,1883, No. 290,396, for a drawing-knife, and it is carried out asfollows, reference being had to the accompanying drawings, whereinFigure 1 represents-a side elevation of the invention, showing one endof the blade and its pivoted handle in section. Fig. 2 represents anenlarged section on the line 2 2, showing the handle in a lockedposition relative to the blade. Fig. 3 represents a similar section,showing the handle in an unlocked position. Fig. 4 represents a detailside view of the handle-locking device. Fig. 5 represents in side andtop views the locking-lever, by means of which thelocking-bolt isoperated; and Fig. 6 represents a detail side view of the pivot andlocking-bolt, by means of which the blade is pivoted and locked to thehandles.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

A represents the blade having shanks A A, terminating at their ends asflattened circular hubs A A, each one of which has a square or polygonalperforation a, as shown in the left-hand portion of Fig. 1 and in Figs.2 and.

3, fora purpose as will hereinafter be more fully shown and described.

B B represent the wooden handles, each one having a longitudinal grooveB, adapted to receive the blade A, when folded upon it, in the samemanner as shown and describedin my former patent above mentioned.

Each handle B has secured to it a metallic hinge-piece 0, provided withparallel shanks O 0' going through longitudinal perforations in the saidhandle and through perforated capped top and bottom ferrules 0 C theformer being preferably made in one piece with the hinge-piece O, asshown in Figs. 2

foration a in the handle-hub A", and through I the forked hub portion 0is made a circular perforation c. The blade is pivoted in each end tothe forked hinge-pieces by means of a pivot and lock bolt having'asquare ortpolygonal lower portion D, adapted to fit into the square orpolygonal perforations c and a in the respective parts 0 and A. Saidlockbolt has'at one end of its square or polygonal part D a head D, andin its opposite end a cylindrical shank D", adapted to fit into thecylindrical perforation c in the forked hub portion 0 as shown.

From the above it will readily be seen that the blade is locked firmlyin position to the handle when the locking-bolt is in the position shownin Fig. 2, be pushed outward to the position shown in Fig. 3ythe handlemay be swung freely relaand if said bolt should tive to the blade inadjusting the position of a the handle to said blade.

In practice I prefer to use in connection with said pivot and lock bolta suitable mechanism for adjusting said bolt and holding it in itslocked position, and for this purpose I have shown in the drawings aforked lever E, having a fulcrum pin e, passing through apreferablyslotted perforation cl in the cylindrical portionD" of thepivot and lock bolt and having a cam projection E, adapted to raise thesaid pivot and locking pin and to hold it in a locked position when saidlever E is swung down against the hinge-piece O, as shown in Fig. 2, andto permit said pin to be pushed downward to the position shown in Fig. 3when it is desirable to adjust the position of the handle relative tothe blade.

In practice I prefer to make the end d of the bolt D" screw-threaded, asshown in Fig.

6, and to provide it with an adjusting nut or 1 the lever E or itsconnections. ner I dispense entirely with notches or projections on theblade ends A A, which in my present case are made circular, and use thepivot-bolts as effective means for loekin g the blade to the handles inany desired positions.

In Fig. 1, A represents the longitudinal concavity of the blade A.Usually such concavity is of equal width throughout its length, which isobjectionable, as it weakens the blade at the junction of its ends andshanks, and for this reason I reduce the width of said concavity A at ornear the ends of the blade A, as shown in Fig. 1, by which the blade ismaterially strengthened.

Having thus fully described the nature, construction, and operation ofmy invention, I wish to secure by Letters Patent and claim 1. A drawingknife having in each of. its ends a square or equivalent perforationcombined with a handle having a forked hinge piece one lip of which hasa perforation like that in the blade end and the other lip hav- In thisman- I ing a circular perforation, and a longitudinally adjustable pivotand locking bolt having a square or equivalent locking portion and acylindrical pivot portion substantially as and for the purpose setforth.

2. A drawing knife having in each of its ends a square or equivalentperforation combined with a handle havinga forked hinge piece one lip ofwhich has a perforation like that in the handle end and the other liphaving a circular perforation a longitudinally adjustable pivot andlocking bolt having a square or equivalent locking portion and means forlongitudinally adjusting the position of said locking and pivot boltsubstantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 9th day of November, A.D. 1893.

I JOHN S. CAN'FELO.

\Vituesses:

ALBAN ANDREN, KITTIE M. HANSON.

